Please answer this question in your own words:  Q1: What layers make up the meninges? And Why can the circle of Willis maintain perfusion of the brain even if there is a blockage in one part of the structure? Also, Why are ganglia and nerves not surrounded by protective structures like the meninges of the CNS?

Anatomy & Physiology
1st Edition
ISBN:9781938168130
Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Chapter13: Anatomy Of The Nervous System
Section: Chapter Questions
Problem 9ILQ: Watch this animation (http://openstaxcollege.org/l/CSFflow) that shows the flow of CSF through the...
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Please answer this question in your own words: 

Q1: What layers make up the meninges? And Why can the circle of Willis maintain perfusion of the brain even if there is a blockage in one part of the structure? Also, Why are ganglia and nerves not surrounded by protective structures like the meninges of the CNS? 

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